Muon collider probes of Majorana neutrino dipole moments and masses
Abstract Majorana neutrinos may have transitional dipole moments, which violate lepton number as well as lepton flavour. We estimate the sensitivity of future colliders to the electron-muon neutrino dipole moment, λ eμ , by considering same-sign dilepton final states. We find that hadron colliders,...
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SpringerOpen
2025-04-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP04(2025)008 |
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| author | Michele Frigerio Natascia Vignaroli |
| author_facet | Michele Frigerio Natascia Vignaroli |
| author_sort | Michele Frigerio |
| collection | DOAJ |
| description | Abstract Majorana neutrinos may have transitional dipole moments, which violate lepton number as well as lepton flavour. We estimate the sensitivity of future colliders to the electron-muon neutrino dipole moment, λ eμ , by considering same-sign dilepton final states. We find that hadron colliders, even the proposed FCC-hh, are sensitive only to |λ eμ | ≳ 10−9 μ B (with μ B the Bohr magneton), a value two-three orders of magnitude larger than current bounds from astrophysics and low-energy neutrino-scattering experiments. In the case of a future muon collider, we show that the sensitivity varies from |λ eμ | ~ 5 ∙ 10−9 μ B for energy s $$ \sqrt{s} $$ ≃ 3 TeV, to ∼ 10 −12 μ B for s $$ \sqrt{s} $$ ≃ 50 TeV, matching the current laboratory bounds for s $$ \sqrt{s} $$ ≃ 30 TeV. The singular advantage of the muon collider signal would be a direct, clean identification of lepton number and flavour violation. We also show that a muon collider would improve by orders of magnitude the direct bounds on m eμ and m μμ , two of the entries of the Majorana neutrino mass matrix. These bounds could be as strong as ∼ 50 keV, still far above the neutrino mass scale. |
| format | Article |
| id | doaj-art-af94167d75eb4cbba84e40d1cea0b775 |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | SpringerOpen |
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| series | Journal of High Energy Physics |
| spelling | doaj-art-af94167d75eb4cbba84e40d1cea0b7752025-08-20T03:53:13ZengSpringerOpenJournal of High Energy Physics1029-84792025-04-012025412610.1007/JHEP04(2025)008Muon collider probes of Majorana neutrino dipole moments and massesMichele Frigerio0Natascia Vignaroli1Laboratoire Charles Coulomb (L2C), University of Montpellier, CNRSDipartimento di Matematica e Fisica, Università del Salento, and Istituto Nazionale di Fisica Nucleare, Sezione di LecceAbstract Majorana neutrinos may have transitional dipole moments, which violate lepton number as well as lepton flavour. We estimate the sensitivity of future colliders to the electron-muon neutrino dipole moment, λ eμ , by considering same-sign dilepton final states. We find that hadron colliders, even the proposed FCC-hh, are sensitive only to |λ eμ | ≳ 10−9 μ B (with μ B the Bohr magneton), a value two-three orders of magnitude larger than current bounds from astrophysics and low-energy neutrino-scattering experiments. In the case of a future muon collider, we show that the sensitivity varies from |λ eμ | ~ 5 ∙ 10−9 μ B for energy s $$ \sqrt{s} $$ ≃ 3 TeV, to ∼ 10 −12 μ B for s $$ \sqrt{s} $$ ≃ 50 TeV, matching the current laboratory bounds for s $$ \sqrt{s} $$ ≃ 30 TeV. The singular advantage of the muon collider signal would be a direct, clean identification of lepton number and flavour violation. We also show that a muon collider would improve by orders of magnitude the direct bounds on m eμ and m μμ , two of the entries of the Majorana neutrino mass matrix. These bounds could be as strong as ∼ 50 keV, still far above the neutrino mass scale.https://doi.org/10.1007/JHEP04(2025)008Baryon/Lepton Number ViolationNon-Standard Neutrino Properties |
| spellingShingle | Michele Frigerio Natascia Vignaroli Muon collider probes of Majorana neutrino dipole moments and masses Journal of High Energy Physics Baryon/Lepton Number Violation Non-Standard Neutrino Properties |
| title | Muon collider probes of Majorana neutrino dipole moments and masses |
| title_full | Muon collider probes of Majorana neutrino dipole moments and masses |
| title_fullStr | Muon collider probes of Majorana neutrino dipole moments and masses |
| title_full_unstemmed | Muon collider probes of Majorana neutrino dipole moments and masses |
| title_short | Muon collider probes of Majorana neutrino dipole moments and masses |
| title_sort | muon collider probes of majorana neutrino dipole moments and masses |
| topic | Baryon/Lepton Number Violation Non-Standard Neutrino Properties |
| url | https://doi.org/10.1007/JHEP04(2025)008 |
| work_keys_str_mv | AT michelefrigerio muoncolliderprobesofmajorananeutrinodipolemomentsandmasses AT natasciavignaroli muoncolliderprobesofmajorananeutrinodipolemomentsandmasses |